condition mean min max ZT0-3 1.3815225 1.15821 1.604835 ZT4-7 1.4098644999999999 1.4098644999999999 1.4098644999999999 ZT8-11 3.009505 3.009505 3.009505 ZT12-15 0 0 0 ZT16-19 3.9208749999999997 3.9208749999999997 3.9208749999999997 ZT20-23 2.67037 2.67037 2.67037